Manipulating the macroscopic phases of solids using ultrashort light pulses has resulted in spectacular phenomena, including metal–insulator transitions, superconductivity and sub pico-second modification of magnetic order. The development of this research area strongly depends on the understanding and optical control of fundamental interactions in condensed matter, in particular the exchange interaction. However, disentangling the timescales relevant for the contributions of the exchange interaction and spin dynamics to the exchange energy, Eex, is a challenge. Here, we introduce femtosecond stimulated Raman scattering to unravel the ultrafast photo-induced dynamics of magnetic excitations at the edge of the Brillouin zone. We find that femtosecond laser excitation of the antiferromagnet KNiF3 triggers a spectral shift of the two-magnon line, the energy of which is proportional to Eex. By unravelling the photo-induced modification of the two-magnon line frequency from a dominating nonlinear optical effect, we find that Eex is increased by the electromagnetic stimulus.

Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet / Batignani, Giovanni; Bossini, D.; Di Palo, N.; Ferrante, Carino; Pontecorvo, Emanuele; Cerullo, G.; Kimel, A.; Scopigno, Tullio. - In: NATURE PHOTONICS. - ISSN 1749-4885. - STAMPA. - 9:8(2015), pp. 506-510. [10.1038/nphoton.2015.121]

Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet

BATIGNANI, GIOVANNI;FERRANTE, CARINO;PONTECORVO, Emanuele;SCOPIGNO, TULLIO
2015

Abstract

Manipulating the macroscopic phases of solids using ultrashort light pulses has resulted in spectacular phenomena, including metal–insulator transitions, superconductivity and sub pico-second modification of magnetic order. The development of this research area strongly depends on the understanding and optical control of fundamental interactions in condensed matter, in particular the exchange interaction. However, disentangling the timescales relevant for the contributions of the exchange interaction and spin dynamics to the exchange energy, Eex, is a challenge. Here, we introduce femtosecond stimulated Raman scattering to unravel the ultrafast photo-induced dynamics of magnetic excitations at the edge of the Brillouin zone. We find that femtosecond laser excitation of the antiferromagnet KNiF3 triggers a spectral shift of the two-magnon line, the energy of which is proportional to Eex. By unravelling the photo-induced modification of the two-magnon line frequency from a dominating nonlinear optical effect, we find that Eex is increased by the electromagnetic stimulus.
2015
Electronic, Optical and Magnetic Materials; Atomic and Molecular Physics, and Optics
01 Pubblicazione su rivista::01a Articolo in rivista
Probing ultrafast photo-induced dynamics of the exchange energy in a Heisenberg antiferromagnet / Batignani, Giovanni; Bossini, D.; Di Palo, N.; Ferrante, Carino; Pontecorvo, Emanuele; Cerullo, G.; Kimel, A.; Scopigno, Tullio. - In: NATURE PHOTONICS. - ISSN 1749-4885. - STAMPA. - 9:8(2015), pp. 506-510. [10.1038/nphoton.2015.121]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/838549
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